EU PVSEC Programme Online
EU PVSEC 2021, 6 - 10 September 2021
Presentation: 5CV.2.13 A Self-Referencing Method for Detecting Underperforming Strings in MWp-PV-Generators
Type: Visual
Date: Wednesday, 8th September 2021
13:30 - 15:00
Author(s): C. Buerhop-Lutz, T. Pickel, J. Hauch, I.M. Peters
Presenter / Speaker: C. Buerhop-Lutz, HI ERN, Erlangen, Germany
Event: Conference Conference
Session: 5CV.2 Operation, Performance and Maintenance of PV Systems
Topic: 5. 3 Operation, Performance and Maintenance of PV Systems
Keywords: Monitoring, PV Modules, Defects, Reliability
Summary / Abstract: For optimization of operation and maintenance of PV power stations the knowledge (identification and localization) of poor-performing modules, strings and inverters is important. The developed self-referencing method analyzes monitoring data, with a particular focus on energy yield. First, a well-performing unit is identified, second, the other units are set into relation to the well-preforming unit. Without weather data and prior-knowledge of the PVsystem poor-performing units (strings, inverters) are identified in this fashion. Three case studies are presented. IRimages verified the failure types. Strings suffering from yield loss due to PID or bridged PV-modules where identified and the yield loss quantified. Strings in bottom rows perform less (-2.6%) than those in top rows. The noise is about 4%, which means, failures with power loss less than 4% are masked in the uncertainty level of the monitoring data, e. g. one bypassed substring, hot cells. Yield relevant module failures such as PID, bridged modules, several bypassed substrings, are identified and localized reliably using the self-referencing method.